CY7C026AV-20AXI Cypress Semiconductor Corp, CY7C026AV-20AXI Datasheet - Page 7

• Manufacturer Part Number: CY7C026AV-20AXI
• Description: IC SRAM 256KBIT 20NS 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C026AV-20AXI

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 256K (16K x 16)
• Speed: 20ns
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Document #: 38-06052 Rev. *M
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
No action
Left port writes 0 to semaphore
Right port writes 0 to semaphore
Left port writes 1 to semaphore
Left port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 1 to semaphore
Right port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 0 to semaphore
Left port writes 1 to semaphore
Notes
10. See
11. If BUSY
12. If BUSY
13. See
CE
H
H
H
X
X
X
X
L
L
L
L
L
L
L
L
Function
Functional Description
Functional Description
R
L
R/W
=L, then no change.
=L, then no change.
H
H
H
H
H
X
X
X
X
X
L
Function
L
L
L
Flag
R
L
Flag
R
Flag
Flag
OE
X
X
X
X
X
H
X
X
X
X
L
L
L
L
L
Inputs
on page 5 for specific highest memory locations by device.
on page 5 for specific addresses by device.
R/W
X
X
X
L
UB
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
L
CE
IO
X
X
L
L
L
LB
0
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
–IO
1
0
0
1
1
0
1
1
1
0
1
17
OE
X
X
X
L
Left
Left Port
L
SEM
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
IO
1FFE
0
High Z
High Z
Data In
High Z
Data In
Data Out
High Z
Data Out
High Z
Data Out
Data Out
Data In
Data In
A
FFF
–IO
0L–13L
L
X
X
1
1
1
0
0
1
1
0
1
1
1
17
[13]
= BUSY
IO
[13]
Right
9
–IO
17
R
Semaphore-free
No change. Right side has no write access to semaphore
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore-free
Right port has semaphore token
Semaphore free
Semaphore-free
Left Port has semaphore token
Left port has semaphore token
= HIGH)
Outputs
INT
H
L
X
X
[11]
[12]
L
High Z
High Z
High Z
Data In
Data In
High Z
Data Out
Data Out
High Z
Data Out
Data Out
Data In
Data In
[10]
CY7C024AV/024BV/025AV/026AV
R/W
IO
X
X
X
L
0
R
–IO
CY7C0241AV/0251AV/036AV
8
CE
X
X
L
L
R
Deselected: Power Down
Deselected: Power Down
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write D
Write D
Not Allowed
Not Allowed
Status
OE
X
L
X
X
Right Port
R
IN0
IN0
1FFE (or 1/3FFE)
FFF (or 1/3FFF)
into Semaphore Flag
into Semaphore Flag
Operation
A
0R–13R
X
X
Page 7 of 20
INT
H
L
[12]
X
X
[11]
R
[+] Feedback